ASK A SCIENTIST… does anything live at the bottom of the ocean?

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The Mariana Trench is the deepest spot in the ocean, nearly 7 miles below the surface. Could anything live that deep? Oceanographer Dawn Wright talks with film producer Jeffrey Silver about what life forms she saw on her recent dive to the bottom of the ocean.
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Interesting that the creatures don't seem to be responding to the lights, even though, I guess, they haven't seen light personally or in an evolutionarily significant part of their ancestry. Was this lack of response general, and have they lost the ability to see or even to perceive light?

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